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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended September 30, 2018:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2018
    
38,086
     $
14.57
  
Vested
    
(2,388
 )   $
16.24
  
Forfeited
    
(200
 )   $
15.50
  
Unvested at September 30, 2018
    
35,498
     $
14.46
  
                 
Nine months ended September 30, 2018:
  
 
 
 
  
 
 
 
Unvested at December 31, 2017
    
25,870
     $
12.15
  
Granted
    
18,323
     $
18.07
  
Vested
    
(7,291
 )   $
15.36
  
Forfeited
    
(1,404
 )   $
14.44
  
Unvested at September 30, 2018
    
35,498
     $
14.46
  
Three months ended September 30, 2017:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2017
    
32,117
     $
12.39
  
Vested
    
(1,692
 )   $
16.80
  
Forfeited
    
(600
 )   $
15.50
  
Unvested at September 30, 2017
    
29,825
     $
12.08
  
                 
Nine months ended September 30, 2017:
  
 
 
 
  
 
 
 
Unvested at December 31, 2016
    
35,264
     $
12.84
  
Granted
    
5,084
     $
15.05
  
Vested
    
(3,923
 )   $
14.66
  
Forfeited
    
(6,600
 )   $
15.50
  
Unvested at September 30, 2017
    
29,825
     $
12.08